I am using the Gigabyte UD4H model motherboard, so I am not sure if it will be the same for you, but I believe that I found this under the Power Management tab in the BIOS settings.
Remember to pull up BIOS with the Delete key at the splash screen, or hit F12 and select "Enter Setup."
Find the "Wake-on-LAN" option and select "Disable" from the drop down menu. Then save & exit and you should be good to go.
I am not actually at my computer at the moment, so I may be wrong about the exact specifics, but the idea is the same. If you are having trouble finding the option then check the other option tabs and don't forget to scroll on some screens to reveal more options if you cannot find it readily available.
Thank you again to soulp0wr for your discovery!